2.1: acetic acid / Reflux 3.1: palladium on carbon; hydrogen / 760.05 Torr 4.1: n-butyllithium / tetrahydrofuran; hexane / -78 °C / Inert atmosphere 4.2: -78 - 20 °C 5.1: oxalyl dichloride; N,N-dimethyl-formamide / dichloromethane / 3 h / 30 °C / Inert atmosphere View Scheme

1.1: acetic acid / Reflux 2.1: palladium on carbon; hydrogen / 760.05 Torr 3.1: n-butyllithium / tetrahydrofuran; hexane / -78 °C / Inert atmosphere 3.2: -78 - 20 °C 4.1: oxalyl dichloride; N,N-dimethyl-formamide / dichloromethane / 3 h / 30 °C / Inert atmosphere View Scheme

1.1: n-butyllithium / tetrahydrofuran; hexane / -78 °C / Inert atmosphere 1.2: -78 - 20 °C 2.1: oxalyl dichloride; N,N-dimethyl-formamide / dichloromethane / 3 h / 30 °C / Inert atmosphere View Scheme

1.1: palladium on carbon; hydrogen / 760.05 Torr 2.1: n-butyllithium / tetrahydrofuran; hexane / -78 °C / Inert atmosphere 2.2: -78 - 20 °C 3.1: oxalyl dichloride; N,N-dimethyl-formamide / dichloromethane / 3 h / 30 °C / Inert atmosphere View Scheme

N-ethyl-N,N-diisopropylamine; bis(dibenzylideneacetone)-palladium(0); [(t-Bu)3PH]BF4 in 1,4-dioxane T=90°C; GloveboxInert atmosphere;

tri-tert-butyl phosphine; N-ethyl-N,N-diisopropylamine; bis(dibenzylideneacetone)-palladium(0) T=120°C;

tri-tert-butyl phosphine; N-ethyl-N,N-diisopropylamine; bis(dibenzylideneacetone)-palladium(0) T=120°C;